Revert "Instrument usage of bug with iteration of String with offset …

…or 0 limit (#1667)"

This reverts commit c743936.

lib/liquid/utils.rb

@@ -16,11 +16,7 @@ def self.slice_collection_using_each(collection, from, to)
 
       # Maintains Ruby 1.8.7 String#each behaviour on 1.9
       if collection.is_a?(String)
-        return [] if collection.empty?
-        if from > 0 || to == 0
-          Usage.increment("string_slice_bug")
-        end
-        return [collection]
+        return collection.empty? ? [] : [collection]
       end
       return [] unless collection.respond_to?(:each)
 

test/unit/tags/for_tag_unit_test.rb

@@ -12,34 +12,4 @@ def test_for_else_nodelist
     template = Liquid::Template.parse('{% for item in items %}FOR{% else %}ELSE{% endfor %}')
     assert_equal(['FOR', 'ELSE'], template.root.nodelist[0].nodelist.map(&:nodelist).flatten)
   end
-
-  def test_for_string_slice_bug_usage
-    template = Liquid::Template.parse("{% for x in str, offset: 1 %}{{ x }},{% endfor %}")
-    assert_usage("string_slice_bug") do
-      assert_equal("abc,", template.render({ "str" => "abc" }))
-    end
-  end
-
-  def test_for_string_0_limit_usage
-    template = Liquid::Template.parse("{% for x in str, limit: 0 %}{{ x }},{% endfor %}")
-    assert_usage("string_slice_bug") do
-      assert_equal("abc,", template.render({ "str" => "abc" }))
-    end
-  end
-
-  def test_for_string_no_slice_usage
-    template = Liquid::Template.parse("{% for x in str, offset: 0, limit: 1 %}{{ x }},{% endfor %}")
-    assert_usage("string_slice_bug", times: 0) do
-      assert_equal("abc,", template.render({ "str" => "abc" }))
-    end
-  end
-
-  private
-
-  def assert_usage(name, times: 1, &block)
-    count = 0
-    result = Liquid::Usage.stub(:increment, ->(n) { count += 1 if n == name }, &block)
-    assert_equal(times, count)
-    result
-  end
 end